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Restructuring Expenses (Restructuring Expense Activities) (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning of period $ 13.9 $ 11.6 $ 16.8
Quarterly provision 5.1 5.4 1.3
Quarterly provision reversal (3.7) (0.7)  
Quarterly cash activity   (2.6) (6.2)
Quarterly cash activity (1.9)    
Foreign currency translation (0.3) 0.2 (0.3)
Restructuring reserve, end of period 13.1 13.9 11.6
Employee Severance      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning of period 11.3 10.0 11.1
Quarterly provision 5.1 3.9 1.3
Quarterly provision reversal (1.2) (0.7)  
Quarterly cash activity   (1.9) (2.3)
Quarterly cash activity (3.0)    
Foreign currency translation (0.2) 0.0 (0.1)
Restructuring reserve, end of period 12.0 11.3 10.0
Facility Closure Costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning of period 0.0 0.0 3.9
Quarterly provision 0.0 0.0 0.0
Quarterly provision reversal 0.0 0.0  
Quarterly cash activity   0.0 (3.9)
Quarterly cash activity 0.0    
Foreign currency translation 0.0 0.0 0.0
Restructuring reserve, end of period 0.0 0.0 0.0
Other Related Closure Costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning of period 2.6 1.6 1.8
Quarterly provision 0.0 1.5 0.0
Quarterly provision reversal 0.0 0.0  
Quarterly cash activity   (0.7) 0.0
Quarterly cash activity (1.4)    
Foreign currency translation (0.1) 0.2 (0.2)
Restructuring reserve, end of period 1.1 2.6 1.6
Gain on Sale of Joint Venture      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning of period 0.0 0.0 0.0
Quarterly provision 0.0 0.0 0.0
Quarterly provision reversal (2.5) 0.0  
Quarterly cash activity   0.0 0.0
Quarterly cash activity 2.5    
Foreign currency translation 0.0 0.0 0.0
Restructuring reserve, end of period $ 0.0 $ 0.0 $ 0.0